Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantas etapas foram vencidas por Robbie McEwen?
 ###Tabelas: CREATE TABLE recent_results_and_forthcoming_fixtures (recent_results_and_forthcoming_fixtures_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Location VARCHAR, Score VARCHAR, Scorers for Chad VARCHAR, Competition VARCHAR) CREATE TABLE women's_doubles:_14_9_titles_5_runner–ups (women's_doubles:_14_9_titles_5_runner–ups_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Year INT, Championship VARCHAR, Surface VARCHAR, Partner VARCHAR, Opponents VARCHAR, Score VARCHAR) CREATE TABLE planica (planica_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Name VARCHAR, Nationality VARCHAR, 1st (m) VARCHAR, 2nd (m) VARCHAR, Points VARCHAR, Overall WC points (Rank) VARCHAR) CREATE TABLE season_5:_2005 (season_5:_2005_id AUTO_INCREMENT PRIMARY KEY, Series Ep. VARCHAR, Episode INT, Netflix VARCHAR, Segment A VARCHAR, Segment B VARCHAR, Segment C VARCHAR, Segment D VARCHAR) CREATE TABLE jersey_progress (jersey_progress_id AUTO_INCREMENT PRIMARY KEY, Stage INT, Winner VARCHAR, General Classification VARCHAR, Mountains Classification VARCHAR, Points Classification VARCHAR, Sprints classification VARCHAR, Team Classification VARCHAR)  
SELECT COUNT Stage FROM jersey_progress WHERE Winner = Robbie McEwen